You could have downloaded RetinaCreate 3D 0.46 for Mac from our application library for free. The program lies within System Tools, more precisely Device Assistants. This free software for Mac OS X is a product of Full Spectrum Laser.
From the developer:
RetinaCreate 3D is ideal for beginners and 3D Printing experts alike, with the best in class automatic tree support algorithm to get you print fast. For the pros, RetinaCreate has advanced user-editable settings and the ability to manually support your model.
You may want to check out more Mac applications, such as Duke Nukem 3D, Wings 3D or Strata Design 3D SE 7, which might be similar to RetinaCreate 3D.
3D Design
Device Assistants